Padlock.



A NQ. esmas. Patented Aug. 22, 189m w, M. THoMPsoN.

PADLUCK.

(Appumion med sepa. s, 159s.)

2 Sheets-Sheet I` (No Model.)

Lg). QNQ/ v uwsla. Patented Aug. 22, .1899,

w. M. THoAmPson.

PADLOCK.

(Application filed. Sept. 8; 1898.) .'(Ilo Modal.) ghslheets-Sheet 2,-

NITED STATES L Erica.

PADLOCK.

SPECIFICATION forming part of Letters Patent No. 631,389, dated August22, 1899.

Application tiled September 3, 1898. Serial No. 690,211. (No model.)

To @ZZ who/1t it 'nw/y concern:

Beit known that 1, WILLIS M. THOMPSON, a resident of Marquette, in thecounty of Marquette and State of Michigan, have invented certain new anduseful Improvements in Padlocks; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such asWill enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to improvements in locks, and more especially' tothat class known as padlocks The primary object of myinvention is toproduce a lock that will be impossible to pick and difficult toduplicate a key with which it may be operated.

Afurther object is to produce alock having a number of tumblers that maybe set in Various combinations and a key that may also be set tocorrespond with the combination of the lock in such manner that it' anattempt to open the lock is made with other than its corresponding keyit will become engaged and impossible to remove to attempt furtherinanipulation.

Illustrations of a lock embodying my in vention are shown in theaccompanying drawings, in which- Figure lis a side view of a padlockembodying my invention. Fig. 2 is a longitudinal sectional view of thesame. Fig. 3 is acrosssection. Fig. 4 is a detail of one ot thetumblers. Fig. 5 is a plain View and section through the key.

Referring to the drawings, wherein similar reference-letters indicatecorresponding parts, I will now explain my invention.

A is a shell or casing provided at one en'd with apertures for thereception of shackle B and at the opposite end is internally threaded toengage with threads on core G, which carries a knob c and a key-guidec', which terminates in a disk c2, both the disk and shell A beingslotted to receive the shackle-arms b.

Passing through the key-guide c is a rotating slotted guide D, which isiianged at its outer end, the iiange being countersunk in the knob candheld in place by a pin d, passing through the disk c2 and engaging witha countersunk nut or washer d. Arranged on shafts E on either side ofthe key-guide are the tumblers F. Projections fon the tumbler-s Fproject normally into 'slots f in the key-guide c and are adapted toengage with the lugs h of the key. vOpposite these projections f are thetumbler-locking arms f2, which engage with notches b' in theshackle-arms h.

In order to hold the tumblersF in the notches b' of the shackle-arms b,I have provided springs G, which are attached to the shafts E and pressagainst the head of the pin g, fixed in the side of the locking-armsfz.

In order to arrange combinations of the tumblers, it is necessary tohitch back one or more of them, so that they will not operate.

For this purpose the spring-hooks g2 are fastened to the edge of thekey-guide c, extending in such manner as to engage the pin-head g whenthe tumblers F are pressed down to the side of the key-guide c', asshown in Figs. 3 and 4.

The keyE consists of a shank slotted to receive dovetailed slide h,which retains the movable lugs h', as shown. These lugs are providedwith dovetailed and beveled heads that tit in suitable slots in thesides of the shank, and when placed in position the slide h is insertedand locks these in position. The object in having the lugs made' movableis to enable suitable combinations to be made to correspond with thecombinations made with the tumblers in the lock proper. To change or'setthe combinations of the lock, as is evident, the case is removed.

To operate or lock and unlock, the combinations of the lock and those ofthe key are setto correspond or register and the rotating guide D set sothat the slot in the knob oregisters with the slot in the key-guide c',thus .allowing the key to be inserted its full length,

when the lugs 72, of the key'will register with the slots f' in thekey-guide c andV through them Will engage the projections f on thetumblers F when the key is turned to the limit, thereby throwing thelocking-arms f2 in and out of engagement with the notches b in the armsof the shackle, securing and releasing it as desired. l

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is v In a padlock the combination with a case andshackle, of spring-pressed tumblers F disposed on shafts E parallel withthe arms l; of said shackle B adapted to be moved thereon and set toregister with an d engage the notches b' in said shackle-arms b, anouter key-guide c' adjacent. to said iuinblers F having slots into whichlugs on said tumblers may extend and engage the lugs of the key, asecondary key-guide extending through the said outer guide c' rotatablytherein, spring-hooks attached to the sides of the said outer guideadapted to engage the pin-heads g in the tumblers F when said tuinblersare pressed inward and against the said outer key-guide c', therebyholding said tumblers out of engageinout with the notches in saidshackle-arms, and a key Composed of a shank having.,r a number ofremovable lugs and a dovetailed slot and slide adapted to look said lugsin position in said shank substantially as described and for the purposeset forth.

ln witness whereof I have signed this Specification, in the presence ottwo subscribing witnesses, this 30th day of July, 1898.

WILLIS M. THoMPsoN. ir.. 5.]

Titnessesz E. D. Mosman, D. N.. PARKER.

